docs: def download_metadata_file(self, outdir, force_rerun=False):
          """Download and load the UniProt XML file"""
  
          uniprot_xml_file = download_uniprot_file(uniprot_id=self.id,
                                                   outdir=outdir,
                                                   filetype='xml',
                                                   force_rerun=force_rerun)
          self.metadata_path = uniprot_xml_file